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part_blk: use Session_policy to determine partition

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Fixes #1714
This commit is contained in:
Emery Hemingway 2015-09-23 14:48:27 +02:00 committed by Christian Helmuth
parent 2f8b3cfdaf
commit dd13bbb1e2
1 changed files with 32 additions and 44 deletions
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76
repos/os/src/server/part_blk/component.h
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@ -5,7 +5,7 @@
*/
/*
* Copyright (C) 2013 Genode Labs GmbH
* Copyright (C) 2013-2015 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
@ -14,6 +14,7 @@
#ifndef _PART_BLK__COMPONENT_H_
#define _PART_BLK__COMPONENT_H_
#include <os/session_policy.h>
#include <base/exception.h>
#include <root/component.h>
#include <block_session/rpc_object.h>
@ -198,31 +199,6 @@ class Block::Root :
Signal_receiver &_receiver;
Block::Partition_table &_table;
long _partition_num(const char *session_label)
{
long num = -1;
try {
using namespace Genode;
Xml_node policy = Genode::config()->xml_node().sub_node("policy");
for (;; policy = policy.next("policy")) {
char label_buf[64];
policy.attribute("label").value(label_buf, sizeof(label_buf));
if (Genode::strcmp(session_label, label_buf))
continue;
/* read partition attribute */
policy.attribute("partition").value(&num);
break;
}
} catch (...) {}
return num;
}
protected:
/**
@ -230,11 +206,37 @@ class Block::Root :
*/
Session_component *_create_session(const char *args)
{
long num = -1;
Session_label label(args);
char const *label_str = label.string();
try {
Session_policy policy(label);
/* read partition attribute */
policy.attribute("partition").value(&num);
} catch (Xml_node::Nonexistent_attribute) {
PERR("policy does not define partition number for for '%s'", label_str);
throw Root::Unavailable();
} catch (Session_policy::No_policy_defined) {
PERR("rejecting session request, no matching policy for '%s'", label_str);
throw Root::Unavailable();
}
if (!_table.partition(num)) {
PERR("Partition %ld unavailable for '%s'", num, label_str);
throw Root::Unavailable();
}
size_t ram_quota =
Arg_string::find_arg(args, "ram_quota" ).ulong_value(0);
size_t tx_buf_size =
Arg_string::find_arg(args, "tx_buf_size").ulong_value(0);
if (!tx_buf_size)
throw Root::Invalid_args();
/* delete ram quota by the memory needed for the session */
size_t session_size = max((size_t)4096,
sizeof(Session_component)
@ -253,29 +255,15 @@ class Block::Root :
throw Root::Quota_exceeded();
}
/* Search for configured partition number and the corresponding partition */
char label_buf[64];
Genode::Arg_string::find_arg(args,
"label").string(label_buf,
sizeof(label_buf),
"<unlabeled>");
long num = _partition_num(label_buf);
if (num < 0) {
PERR("No confguration found for client: %s", label_buf);
throw Root::Invalid_args();
}
if (!_table.partition(num)) {
PERR("Partition %ld unavailable", num);
throw Root::Unavailable();
}
Ram_dataspace_capability ds_cap;
ds_cap = Genode::env()->ram_session()->alloc(tx_buf_size);
return new (md_alloc())
Session_component *session = new (md_alloc())
Session_component(ds_cap,
_table.partition(num),
_ep, _receiver);
PLOG("session opened at partition %ld for '%s'", num, label_str);
return session;
}
public: